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International C113 Engine

The International Harvester C113 is a heavy-duty, inline 4-cylinder, liquid-cooled internal combustion gasoline engine. Introduced in 1939, it served as a foundational powerplant for an iconic lineup of International Harvester / Farmall tractors, including the models A, AV, B, BN, and C. Engineered for agricultural longevity, the engine utilizes a cast-iron block with wet cylinder sleeves, allowing for direct overhaul and rebuilding without re-boring the block.

Valve Configuration: Vertical overhead valve (I-head) configuration driven by a gear-activated camshaft. Firing Order: 1-3-4-2. Bore (Cylinder Diameter): 3.00 inches (76 mm). Stroke (Piston Travel): 4.00 inches (102 mm). Total Displacement: 113.1 cubic inches (1.9 Liters). Lubrication System: Positive pressure feed distributed via an internal oil pump to critical crankshaft and connecting rod bearings. Filtration: Replaceable bypass-element oil filter canister mounted externally on the engine block.

Fuel System: Single updraft carburetor setup mated to a cast iron intake and exhaust manifold combination. Fuel Feed: Gravity-fed from an overhead fuel tank, bypassing the mechanical fuel pump requirement. Air Filtration: High-efficiency oil bath air cleaner assembly designed to trap heavy field dust before air enters the carburetor venture choke. Fuel Options: Primarily configured for standard gasoline, though low-compression variants were distributed as distillate/kerosene tractor configurations.

Cooling System: Liquid-cooled. Early-production iterations utilized a thermo-siphon configuration reliant on thermal convection, eliminating the need for a mechanical water pump. Later variants utilized a traditional water pump and thermostat loop. Air Circulation: Belt-driven pulling fan positioned behind the radiator matrix.

General Technical Data

Engine Specifications

Engine Model ............... International Harvester C113
Engine Base Variant ............... C-113 Gasoline/Kerosene
Engine Type ............... 4-stroke overhead valve liquid-cooled internal combustion engine
Number of Cylinders ............... 4
Cylinder Arrangement ............... Vertical in-line
Cylinder Block Architecture ............... Monoblock with wet replaceable liners
Engine Bore, in (mm) ............... 3.00 (76.2)
Engine Stroke, in (mm) ............... 4.00 (101.6)
Displacement, cu.in (L) ............... 113.1 (1.85)
Compression Ratio (Gasoline) ............... 6.0:1
Compression Ratio (Kerosene) ............... 5.33:1
Rated Engine Power at 1400 rpm, hp (kW) ............... 17.0 (12.7)
Maximum Engine Power at 1650 rpm, hp (kW) ............... 23.0 (17.2)
Drawbar Power Std Operational, hp (kW) ............... 16.32 (12.17)
Belt Pulley Power Std Operational, hp (kW) ............... 18.34 (13.68)
Rated Engine Speed, rpm ............... 1400-1650
Low Idle Speed, rpm ............... 500-525
High Idle Speed No Load, rpm ............... 1540-1850
Firing Order ............... 1-3-4-2
Combustion Chamber Design ............... High-turbulence I-head open chamber
Cylinder Block Material ............... High-tensile cast alloy iron
Cylinder Head Material ............... Fine-grain gray cast iron
Crankshaft Material ............... Drop-forged carbon steel induction hardened
Camshaft Material ............... Prototypical chill-cast alloy iron
Main Bearings Quantity ............... 3 replaceable precision inserts
Connecting Rod Bearings Quantity ............... 4 pair precision insert style
Lubrication System ............... Full-pressure gear pump circulating system
Cooling System ............... Thermo-siphon circulation (optional centrifugal pump)
Governor Type ............... Mechanical flyweight centrifugal governor
Air Cleaner Configuration ............... Heavy duty oil bath design
Ignition System Type ............... High tension magneto (optional distributor battery)
Spark Plug Electrode Clearance Gap, in (mm) ............... 0.025 (0.635)
Ignition Breaker Point Gap Contact, in (mm) ............... 0.020 (0.508)
Magneto Model Original Specs ............... IH H4 or Fairbanks Morse FM-J4
Distributor Model Original Specs ............... Delco-Remy mechanical advance
Starting System Configuration ............... Electric starter motor or standard manual crank
Electrical System Voltage ............... 6V

Fuel System

Fuel Type Designation ............... Low-lead gasoline, distillate, tractor fuel, or kerosene
Carburetor Manufacturer ............... Zenith or Marvel-Schebler
Carburetor Model (Zenith) ............... 61AX7 or 161X7 up-draft configuration
Carburetor Model (Marvel-Schebler) ............... TSX-248 or TSX-156 up-draft style
Fuel Feed Method ............... Gravity feed from elevated main storage tank
Main Fuel Tank Capacity, gal (L) ............... 11.0 (41.6)
Auxiliary Starting Fuel Tank Capacity, gal (L) ............... 1.0 (3.8)
Carburetor Throttle Bore Diameter, in (mm) ............... 1.00 (25.4)
Carburetor Venturi Size, in (mm) ............... 0.75 (19.05)
Main Jet Size Standard Sea Level ............... Fixed or adjustable metering needle style
Idle Jet Orifice Diameter, in (mm) ............... 0.020 (0.508)
Fuel Sediment Bowl Filter Element ............... Fine mesh brass screen with water trap glass
Fuel Mixture Ratios Control ............... Manual adjustable high-speed needle wheel valve
Air Intake Tube Diameter, in (mm) ............... 1.50 (38.1)
Fuel Delivery Pressure ............... Atmospheric gravity head pressure only

Dimensions and Weight

Overall Length, in (mm) ............... 34.5 (875)
Overall Width, in (mm) ............... 19.25 (490)
Overall Height, in (mm) ............... 31.0 (785)
Dry Weight, lbs (kg) ............... 385 (175)
Wet Weight, lbs (kg) ............... 440 (200)

Maintenance Data

Service Information

Compression Pressure, psi (bar) ............... 110-120 (7.58-8.27)
Minimum Service Compression, psi (bar) ............... 90.0 (6.21)
Oil Pressure Standard Operational, psi (bar) ............... 30-35 (2.07-2.41)
Oil Pressure Minimum Idle Safe Limit, psi (bar) ............... 10.0 (0.69)
Coolant Operating Temperature Range, F (C) ............... 165-195 (73.9-90.5)
Intake Valve Clearance, in (mm) ............... 0.014-0.016 (0.356-0.406)
Exhaust Valve Clearance, in (mm) ............... 0.014-0.016 (0.356-0.406)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W, SAE 20W, or SAE 30
API Service Classifications ......................... CC or CD
Engine Crankcase Oil Capacity, qt (L) ............... 5.0 (4.7)
Coolant Total Fluid Capacity, qt (L) ............... 13.0 (12.3)
Air Cleaner Oil Reservoir Capacity, pt (L) ............... 1.0 (0.47)

Service Intervals

Change oil and filter ............... Every 100 hours
Inspect air filter ............... Every 150 hours
Valve clearance adjustment ............... Every 500 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 1000 hours
Spark plug replacement ............... Every 500 hours
Check distributor points ............... Every 500 hours

Service Specifications

Cylinder Sleeve Flange Height Standing, in (mm) ............... 0.002-0.005 (0.051-0.127)
Cylinder Sleeve Wall Thickness Original, in (mm) ............... 0.250 (6.35)
Cylinder Sleeve Out of Round Maximum Allowed, in (mm) ............... 0.0015 (0.0381)
Cylinder Sleeve Taper Service Max Limit, in (mm) ............... 0.0030 (0.0762)
Crankshaft Main Journal Diameter (Number One), in (mm) ............... 2.498 (63.449)
Crankshaft Main Journal Diameter (Number Two), in (mm) ............... 2.498 (63.449)
Crankshaft Main Journal Diameter (Number Three), in (mm) ............... 2.498 (63.449)
Crankpin Journal Diameter (All), in (mm) ............... 2.000 (50.8)
Crankshaft Main Journal Length (Number One), in (mm) ............... 2.125 (53.975)
Crankshaft Main Journal Length (Number Two), in (mm) ............... 2.250 (57.15)
Crankshaft Main Journal Length (Number Three), in (mm) ............... 2.500 (63.5)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0020-0.0035 (0.0508-0.0889)
Crankshaft End Play, in (mm) ............... 0.0120 (0.3048)
Intake Valve Stem Diameter, in (mm) ............... 0.341 (8.661)
Exhaust Valve Stem Diameter, in (mm) ............... 0.340 (8.636)
Intake Valve Head Diameter, in (mm) ............... 1.437 (36.50)
Exhaust Valve Head Diameter, in (mm) ............... 1.312 (33.32)
Valve Spring Free Length, in (mm) ............... 2.125 (53.975)
Valve Guide Inside Diameter, in (mm) ............... 0.343 (8.712)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0032 (0.0381-0.0813)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0025-0.0042 (0.0635-0.1067)
Camshaft Journal Diameter (Number One), in (mm) ............... 1.875 (47.625)
Camshaft Journal Diameter (Number Two), in (mm) ............... 1.750 (44.45)
Camshaft Journal Diameter (Number Three), in (mm) ............... 1.625 (41.275)
Camshaft Base Circle Radius Lobe, in (mm) ............... 0.625 (15.875)
Cam Lobe Lift (Intake), in (mm) ............... 0.285 (7.239)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.285 (7.239)
Camshaft End Play, in (mm) ............... 0.0030-0.0060 (0.0762-0.1524)
Piston to Cylinder Sleeve Clearance, in (mm) ............... 0.0030-0.0045 (0.0762-0.1143)
Piston Pin Bore Diameter, in (mm) ............... 0.875 (22.225)
Piston Skirt Nominal Diameter, in (mm) ............... 2.997 (76.124)
Piston Pin to Con Rod Bushing Clearance, in (mm) ............... 0.0003-0.0007 (0.0076-0.0178)
Top Ring Groove Width, in (mm) ............... 0.125 (3.175)
Second Ring Groove Width, in (mm) ............... 0.125 (3.175)
Third Ring Groove Width, in (mm) ............... 0.125 (3.175)
Oil Ring Groove Width, in (mm) ............... 0.250 (6.35)
Top Ring End Gap, in (mm) ............... 0.007-0.017 (0.178-0.432)
Second Ring End Gap, in (mm) ............... 0.007-0.017 (0.178-0.432)
Third Ring End Gap, in (mm) ............... 0.007-0.017 (0.178-0.432)
Oil Ring End Gap, in (mm) ............... 0.007-0.017 (0.178-0.432)
Top Ring Side Clearance, in (mm) ............... 0.0020-0.0035 (0.0508-0.0889)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0030 (0.0381-0.0762)
Third Ring Side Clearance, in (mm) ............... 0.0015-0.0030 (0.0381-0.0762)
Oil Ring Side Clearance, in (mm) ............... 0.0015-0.0030 (0.0381-0.0762)

Tightening Torque Specs

Cylinder Head Studs,Step One, lb-ft (Nm) ............... 25.0 (33.9)
Cylinder Head Studs,Step Two, lb-ft (Nm) ............... 50.0 (67.8)
Cylinder Head Studs, Final, lb-ft (Nm) ............... 80.0 (108.5)
Connecting Rod Cap Nuts, Step One, lb-ft (Nm) ............... 15.0 (20.3)
Connecting Rod Cap Nuts, Final, lb-ft (Nm) ............... 40-45 (54.2-61.0)
Main Bearing Cap Bolts, Step One, lb-ft (Nm) ............... 35.0 (47.5)
Main Bearing Cap Bolts, Final, lb-ft (Nm) ............... 75-80 (101.7-108.5)
Flywheel to Crankshaft Mounting Bolts, lb-ft (Nm) ............... 55-60 (74.6-81.3)
Crankshaft Front Pulley Nut, lb-ft (Nm) ............... 100-110 (135.6-149.1)
Camshaft Thrust Plate Retaining Screws, lb-ft (Nm) ............... 15-18 (20.3-24.4)
Camshaft Timing Gear Center Retaining Bolt, lb-ft (Nm) ............... 45-50 (61.0-67.8)
Rocker Arm Shaft Bracket to Head Stud Nuts, lb-ft (Nm) ............... 25-30 (33.9-40.7)
Manifold to Cylinder Head Nuts Retaining Studs, lb-ft (Nm) ............... 20-25 (27.1-33.9)
Oil Pan Oil Sump Perimeter Retaining Bolts, lb-ft (Nm) ............... 12-15 (16.3-20.3)
Oil Pan Sump Bottom Drain Plug Flanged, lb-ft (Nm) ............... 35-40 (47.5-54.2)
Timing Gear Case Cover Retaining Bolts, lb-ft (Nm) ............... 12-15 (16.3-20.3)
Governor Housing Mounting Stud Nuts, lb-ft (Nm) ............... 18-22 (24.4-29.8)
Water Outlet Elbow to Cylinder Head Bolts, lb-ft (Nm) ............... 15-18 (20.3-24.4)
Water Inlet Pipe Conduit Flange Screws, lb-ft (Nm) ............... 15-18 (20.3-24.4)
Spark Plug Core Shell Mechanical, lb-ft (Nm) ............... 25-30 (33.9-40.7)
Magneto Assembly Mounting Flange Nuts Studs, lb-ft (Nm) ............... 15-18 (20.3-24.4)
Distributor Base Housing Clamp Locking Screw, lb-ft (Nm) ............... 8-10 (10.8-13.6)
Carburetor Flange Mounting Nuts Air Inlet Studs, lb-ft (Nm) ............... 12-15 (16.3-20.3)
Flywheel Housing Outer Cover Shell Plate Bolts, lb-ft (Nm) ............... 25-30 (33.9-40.7)
Valve Rocker Arm Valve Cover Center Nut Retainer, lb-ft (Nm) ............... 8-10 (10.8-13.6)
Oil Pump Cover Assembly Retaining Screws, lb-ft (Nm) ............... 10-12 (13.6-16.3)
Oil Pump Body Housing to Block Anchor Bolt, lb-ft (Nm) ............... 15-18 (20.3-24.4)
Fan Bracket Support Anchor Stud Locking Nut, lb-ft (Nm) ............... 35-40 (47.5-54.2)
Crankcase Breather Tube Shield Retaining Nut, lb-ft (Nm) ............... 8-10 (10.8-13.6)
Fuel Sediment Bowl Metal Bail Assembly Nut, lb-ft (Nm) ............... 4-6 (5.4-8.1)

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